Serial 36-pulse Rectifier Based on Serial-Parallel Hybrid Pulse Multiplier Circuit

Abstract

A series-type 36-pulse rectifier based on a series-parallel hybrid pulse multiplying circuit belongs to the technical field of power electronics. The invention aims to solve the problem of how to improve the current harmonic suppression capability of the series-type 12-pulse rectifier without substantially increasing the complexity of the rectifier. The invention includes a phase-shifting transformer, a first three-phase full-bridge rectifier circuit, a second three-phase full-bridge rectifier circuit, a balanced reactor with a center tap, and a capacitor C 1 , capacitor C 2 and series-parallel hybrid pulse multiplier circuit; wherein, the series-parallel hybrid pulse multiplier circuit includes a transformer with double secondary windings, a first single-phase rectifier circuit and a second single-phase rectifier circuit, through the transformer with double secondary windings The alternating conduction of the rectifier elements connected to the secondary side forms a specific circulating current on the DC side, which offsets the low-order harmonics in the input current of the rectifier, and achieves the effect of increasing the pulse number of the rectifier by 3 times, and realizes the reduction of harmonics on the grid side. inhibition. It is suitable for high-power rectification occasions that require high power quality.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a multi-pulse rectifier. Background technique [0002] Because of its simple structure, high reliability and low price, 12-pulse rectifiers are widely used in medium-high-voltage and high-power industrial occasions such as ship electric propulsion, urban rail power supply, and high-voltage DC transmission. However, due to the strong nonlinearity of the rectifier diodes in the rectifier, the 12-pulse rectifier still produces more harmonics. When used alone, the THD of the input current of the 12-pulse rectifier is usually greater than 10%, which cannot meet the requirements of harmonic standards such as IEEE-519 and IEC-16, and has become the main source of harmonics in the power grid. [0003] Although the number of pulses of the rectifier can be further increased by phase-shifting multiple connections, thereby further reducing the harmonics of the input cu...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of how to improve the current harmonic suppression capability of the series-type 12-pulse rectifier without increasing the complexity of the rectifier. The present invention provides a series-parallel hybrid pulse multiplication circuit Type 36 Pulse Rectifier

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